Photographic projection apparatus



A. KONIECZNY.

PHOTOGRAPH) PROJECTION APPARATUS.

APPLICATION FILED JULY 21,1915.

1,346, 1 9. Patented July 13, 1920.

2310675531? m I l I ANTON KONIECZN'Y,

0F VIENNA, AUSTRIA.

PHOTOGRAPHIC PROJECTION APPARATUS.

Specification of Letters Patent.

Patented July 13, 1920.

Application filed July 21, 1915. Serial No. 41,148.

To all whom it may concern:

Be it known that I, A.NTON KoNiEczNY, laboratory assistant, Vienna VI,lliariahilferstrasse 55, Austria, have invented a new and usefulImprovement in Photographic Projection Apparatus, of which the followingis a full, clear, and exact description, reference being had to theaccompanying drawings, making part of this specification.

y invention relates to a photographic projecting apparatus, adapted moreespe cially for enlarging pictures.

In devices for this general purpose, with which I am familiar, it hasbeen necessary to employ extremely expensive condenser lenses in orderto obtain a fairly uniform distribution of light to the picture to beenlarged. In a great many cases the cost of such lenses makes the workalmost prohibitive.

Moreover the effect produced is not always satisfactory, as frequentlythe details of the picture are lost in the enlarging process, and thelights and shadows are extremely poorly reproduced.

The principal object of my invention is to provide a simple apparatus,which may be produced at a very moderate cost, and by means of whichfaithful enlargements may be obtained even by those not skilled in thephotographic art.

Stated briefly, the object of my invention is accomplished by providingwithin a suit able case a substantially elongated source of lightcoaxial with tangular conical reflector. As an adjunct to thecombination of the elongated source of light with the reflector, I mayand usually do use a mirror between the light source and the negativefor the purpose of directing the rays of light to the latter.

The preferred embodiment of the invention is illustrated in theaccompanying drawing which shows a schematic view of the device, partsappearing in section.

Referring to the drawing?) denotes a casing of any suitable form havingsuspended therein an elongated source of light a. Any suitable source oflight may be employed, although in the present instance an electric bulbis disclosed. Surrounding the source of light a. and coaxial therewithis a reflector d which is rectangular in cross section and surrounded bya recand is cone shaped, with the apex of the cone at the upper end ofthe source of light a.

The lower end of the casing Z) may be provided with an, opening which isclosed by a red glass window 6 through which the action of the devicemay be observed. Adapted to be connected with the casing 6 16 a lowercasing 7' near the upper end of which may be supported a ground glassplate n, and resting within the casing f at an angle of approximately 45is a mirror 0 which is used to direct the rays of light emanating fromthe source a, in the direction of the negative.

At the front of the casing f a photographic frame Q a is supported, thelatter carrying the negative 7) of which an. enlargement is desired. Inline with the frame 9 u is a camera 8 of any suitable construction, andit will be apparent that the rays of light issuing from the source a arethrown by the reflector d against the mirror 0 and by the latter aredirected in parallel lines against the negative 79 which is enlarged bymeans of the camera 8.

The ground glass 12 may be omitted if de sired. If it be desired thatthe enlargement have clear sharp lines the ground glass it is not used,but if softened tones be aimed at then the ground glass 91 is employedin the position shown in the drawing.

What I claim is 1. A photographic projecting apparatus for the purposespecified, comprising a easing, an elongated source of light thereon,and a reflector surrounding and coaxial with. said source of light, saidreflector consisting of an upper wall at right angles to the axis of thesource of light and a lateral wall at an obtuse angle to the upper wall.

2. A photographic projection apparatus as specified, comprising acasing, an elongated source of light therein-and a conical reflectorsurrounding and coaxial with said source of light, said reflector havingan apex angle of ninety degrees.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

ANTON KONIECZNY.

Witnesses:

RUnoLr THEUMERZ, ARTHUR Hnnzoe.

